Lie flat on your back, shoulder blades on the deck, knees bent, and both feet flat.
A buddy may be used to anchor a Marine's legs or feet.
Keep your arms crossed and tight against your body.
One rep consists of raising the upper body from the starting position until both forearms or elbows touch your thighs.
Return to the starting position.
Keep your backside on the deck throughout the exercise.
For a maximum score execute 100 crunches in 2 minutes.